I was checking the brake fluid level on my 2012 RT and when I was done I tried to close the seat & have it "Lock Down." Well it seemed to close all right but Won't "Lock Down." I noticed the piece that goes thru the locking mechanism is oval in shape, the reason I notice that, was because the pin or locking shaft or whatever it's called, fell out of the place it's supposed to be. My question is, the bottom of that pin is oval in shape and I couldn't tell weather the Oval Shape of the pin is supposed to be oval front to back or side to side. Does the plastic piece that holds that shaft/pin have to be seated in the slot that it fits into? Thanks